An antique line engraving published by W. Bridge, Bookseller, Conway.  The following information is given underneath the image   -   'Extreme length of chain 1715 ft.  Total wt. of iron works 4,373,281lbs.  First stone was laid Aug. 10. 1819.  Opened for public use Jan. 30, 1826.
Approx 14cms by 9cms.